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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bdfc88f272105b7f2e1e7423a4f11d8e747d8b8160f44eecee08415c25ab1f' 
  AND token = 'rra90eNj6BHPDL2HpH7RPKXHxHBi3TSAkaErvaBELXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}